Soil conditioner

Abstract

A soil conditioner is provided that can clean and improve soil by effectively adsorbing harmful substances, even if it is soil with a lot of underground water, through efficient use of as little adsorbent of harmful substances as possible. The soil conditioner is made by mixing an adsorbent of harmful substances and a water absorbing substance, and shaping the mixture into granular shape.

Description

TECHNICAL FIELD [0001] The present invention relates to soil modifiers for cleaning and improving soil that has been contaminated by harmful substances, such as chemicals. BACKGROUND ART [0002] Various methods for cleaning contaminated soil have been proposed and implemented in the past, starting with excavating the contaminated soil and replacing it with new soil, but overall they are elaborate and require considerable costs to improve the soil. [0003] In this regard, methods using soil conditioners are comparatively simple and also inexpensive, and can reduce the content of harmful substances below the regulatory values by adsorbing the harmful substances by mixing a soil conditioner into the soil. [0004] Conventionally, almost all soil conditioners used for such methods were produced only from adsorbents of harmful substances (cerium or lanthanum hydrates or the like) serving as the main ingredient (see for example, JP 2001-200236A). [0005] Thus, since almost all conventional soi...

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Benefits of technology

[0009] With this first characteristic configuration of the present invention, the soil conditioner is made by mixing adsorbent of harmful substances and a water absorbing substance and shaping the mixture, so that the water absorbing substance absorbs water, and the adsorbent of harmful substances adsorbs harmful substances in the absorbed water, and consequently, it is possible to clean soil by reliably adsorbing harmful substances diluted in underground water, even if it is soil with a lot of underground water.

[0022] With this seventh characteristic configuration of the present invention, cerium oxide in the waste glass abrasive is modified into cerium hydroxide and used as the adsorbent of harmful substances, so that, as becomes clear from the following experimental results, a soil conditioner in which the adsorption ratio for arsenic and the like is considerably improved and that has even better adsorption capability compared to the case that the waste glass abrasive is used unmodified can be provided inexpensively.

Problems solved by technology

Various methods for cleaning contaminated soil have been proposed and implemented in the past, starting with excavating the contaminated soil and replacing it with new soil, but overall they are elaborate and require considerable costs to improve the soil.

Thus, since almost all conventional soil conditioners are produced only from the adsorbents of harmful substances serving as the main ingredient, they have the disadvantage that their soil improving effect is poor considering that relatively expensive adsorbents of harmful substances are used in large amounts.

In particular in soils with a lot of underground water, the above-mentioned disadvantage is clearly noticeable, because harmful substances such as heavy metals are eluted and drained out, so that there is a need for improvement of this aspect.

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